从KOObservable阵列中删除重复项 [英] Remove duplicate from KOObservable array
本文介绍了从KOObservable阵列中删除重复项的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
想从KoObservableArray中删除重复的值.我有以下JS文件.我想将UI中的名称列绑定为下拉列表，并删除重复的值.
Want to remove duplicate values from KoObservableArray. I have following JS file. I want to bind the name column in the UI as dropdown as well as to remove the duplicate values.
建议执行此操作的最佳方法.
Suggest the best way to do the same.
JS文件
$(function () {
var initialData = [
{ name: "Well-Travelled Kitten", sales: 352, price: 75.95 },
{ name: "Speedy Coyote", sales: 89, price: 190.00 },
{ name: "Furious Lizard", sales: 152, price: 25.00 },
{ name: "Furious Lizard", sales: 213, price: 25.00 },
{ name: "Indifferent Monkey", sales: 1, price: 99.95 },
{ name: "Speedy Coyote", sales: 89, price: 190.00 },
{ name: "Brooding Dragon", sales: 0, price: 6350 },
{ name: "Ingenious Tadpole", sales: 39450, price: 0.35 },
{ name: "Optimistic Snail", sales: 420, price: 1.50 }
];
var PagedGridModel = function (items) {
this.items = ko.observableArray(items);
};
ko.applyBindings(new PagedGridModel(initialData));
});
HTML File
<body>
<nav>
<label for="name">Name</label>
<select id="name" data-bind="options: items, optionsText: 'name', optionsCaption:'All'">
</select>
</nav>
</body>
以上内容使我下拉菜单中出现重复的名称.
The above give me drop down with duplicate names.
推荐答案
请参见下面的示例，了解如何使计算的可观察值返回数组.我刚刚写下了过滤逻辑，但它可能不是正确的或最优的，我会留给您进行改进.
See below for a sample of how you can have a computed observable returning an array. I have just written down the logic for filtering but it may not be correct or optimal, I will leave it to you to improve on it.
$(function () {
var initialData = [
{ name: "Well-Travelled Kitten", sales: 352, price: 75.95 },
{ name: "Speedy Coyote", sales: 89, price: 190.00 },
{ name: "Furious Lizard", sales: 152, price: 25.00 },
{ name: "Furious Lizard", sales: 213, price: 25.00 },
{ name: "Indifferent Monkey", sales: 1, price: 99.95 },
{ name: "Speedy Coyote", sales: 89, price: 190.00 },
{ name: "Brooding Dragon", sales: 0, price: 6350 },
{ name: "Ingenious Tadpole", sales: 39450, price: 0.35 },
{ name: "Optimistic Snail", sales: 420, price: 1.50 }
];
var PagedGridModel = function (items) {
var self = this;
self.items = ko.observableArray(items);
self.uniqueItems = ko.computed({
var filteredArray = [];
var i;
$.each(self.items(), function (index, item) {
bool alreadyAdded = false;
for (i in filteredArray) {
if (filteredArray[i].name == item.name) {
alreadyAdded = true;
}
}
if (!alreadyAdded) {
filteredArray.push(item);
}
});
return filteredArray;
});
};
ko.applyBindings(new PagedGridModel(initialData));
});
最后是您的HTML
<select id="name" data-bind="options: uniqueItems, optionsText: 'name', optionsCaption:'All'">
</select>
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